There seems to be a work-around, you can get them delivered with getting options exercised
@lklundin made this work, maybe he can comment...
I can't take credit for this idea (that I saw somewhere), but I can state that it has credibly been reported to work:
1) Find money to buy the ARK fund in multiples of 100 shares,
2) Find a broker that allows you to trade in options with the desired ARK fund as underlying [*].
3) Consider enabling margin - or else have the money for the shares locked in the account,
4) For each desired 100 hundred shares buy 100 synthetic shares, i.e. buy 1 call option and sell 1 put option with identical underlying, expiration and strike and premiums that for example (approximately) cancel each other out,
5) One of the two options will expire OTM, the other ITM, in either case the shares will subsequently be delivered to your account (and cash equivalent to the strike drawn),
6) Marvel at the concept of a portfolio with shares other than Tesla and ignore any warnings that these shares are unavailable for buying (what do you care, you just went through all this trouble, exactly to not have to try to buy them),
7) Profit???
A concern that there will be trouble at expiry can be reduced by choosing an expiry as far into the future as possible - since that increases the chance that the regulatory issue will be resolved before expiry.
Alternative to 5) + 6): as expiry nears one can roll (i.e. sell + re-buy) the options to a new, distant expiry, thus maintaining the long (synthetic) exposure without actually getting to own the shares.
[*] I can recommend IBKR - and to people who consider me friendly I can provide a referral link (Yes, IBKR requires this to only be done as a friendly gesture...).